| Message ID | 20231112173251.4827-1-wahrenst@gmx.net (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | watchdog: bcm2835_wdt: Fix WDIOC_SETTIMEOUT handling | expand |
On Sun, Nov 12, 2023 at 06:32:51PM +0100, Stefan Wahren wrote: > Users report about the unexpected behavior for setting timeouts above > 15 sec on Raspberry Pi. According to watchdog-api.rst the ioctl > WDIOC_SETTIMEOUT shouldn't fail because of hardware limitations. > But looking at the code shows that max_timeout based on the > register value PM_WDOG_TIME_SET, which is the maximum. > > Since 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat > in watchdog core") the watchdog core is able to handle this problem. > > This fix has been tested with watchdog-test from selftests. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=217374 > Fixes: 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat in watchdog core") > Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/watchdog/bcm2835_wdt.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c > index 7a855289ff5e..bb001c5d7f17 100644 > --- a/drivers/watchdog/bcm2835_wdt.c > +++ b/drivers/watchdog/bcm2835_wdt.c > @@ -42,6 +42,7 @@ > > #define SECS_TO_WDOG_TICKS(x) ((x) << 16) > #define WDOG_TICKS_TO_SECS(x) ((x) >> 16) > +#define WDOG_TICKS_TO_MSECS(x) ((x) * 1000 >> 16) > > struct bcm2835_wdt { > void __iomem *base; > @@ -140,7 +141,7 @@ static struct watchdog_device bcm2835_wdt_wdd = { > .info = &bcm2835_wdt_info, > .ops = &bcm2835_wdt_ops, > .min_timeout = 1, > - .max_timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET), > + .max_hw_heartbeat_ms = WDOG_TICKS_TO_MSECS(PM_WDOG_TIME_SET), > .timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET), > }; > > -- > 2.34.1 >
On 11/12/23 09:32, Stefan Wahren wrote: > Users report about the unexpected behavior for setting timeouts above > 15 sec on Raspberry Pi. According to watchdog-api.rst the ioctl > WDIOC_SETTIMEOUT shouldn't fail because of hardware limitations. > But looking at the code shows that max_timeout based on the > register value PM_WDOG_TIME_SET, which is the maximum. > > Since 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat > in watchdog core") the watchdog core is able to handle this problem. > > This fix has been tested with watchdog-test from selftests. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=217374 > Fixes: 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat in watchdog core") > Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Hi, Am 13.11.23 um 15:31 schrieb Guenter Roeck: > On Sun, Nov 12, 2023 at 06:32:51PM +0100, Stefan Wahren wrote: >> Users report about the unexpected behavior for setting timeouts above >> 15 sec on Raspberry Pi. According to watchdog-api.rst the ioctl >> WDIOC_SETTIMEOUT shouldn't fail because of hardware limitations. >> But looking at the code shows that max_timeout based on the >> register value PM_WDOG_TIME_SET, which is the maximum. >> >> Since 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat >> in watchdog core") the watchdog core is able to handle this problem. >> >> This fix has been tested with watchdog-test from selftests. >> >> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217374 >> Fixes: 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat in watchdog core") >> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> > Reviewed-by: Guenter Roeck <linux@roeck-us.net> who takes care of this patch?
Hi Stefan, > Hi, > > Am 13.11.23 um 15:31 schrieb Guenter Roeck: > >On Sun, Nov 12, 2023 at 06:32:51PM +0100, Stefan Wahren wrote: > >>Users report about the unexpected behavior for setting timeouts above > >>15 sec on Raspberry Pi. According to watchdog-api.rst the ioctl > >>WDIOC_SETTIMEOUT shouldn't fail because of hardware limitations. > >>But looking at the code shows that max_timeout based on the > >>register value PM_WDOG_TIME_SET, which is the maximum. > >> > >>Since 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat > >>in watchdog core") the watchdog core is able to handle this problem. > >> > >>This fix has been tested with watchdog-test from selftests. > >> > >>Link: https://bugzilla.kernel.org/show_bug.cgi?id=217374 > >>Fixes: 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat in watchdog core") > >>Signed-off-by: Stefan Wahren <wahrenst@gmx.net> > >Reviewed-by: Guenter Roeck <linux@roeck-us.net> > who takes care of this patch? I did. Kind regards, Wim.
diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c index 7a855289ff5e..bb001c5d7f17 100644 --- a/drivers/watchdog/bcm2835_wdt.c +++ b/drivers/watchdog/bcm2835_wdt.c @@ -42,6 +42,7 @@ #define SECS_TO_WDOG_TICKS(x) ((x) << 16) #define WDOG_TICKS_TO_SECS(x) ((x) >> 16) +#define WDOG_TICKS_TO_MSECS(x) ((x) * 1000 >> 16) struct bcm2835_wdt { void __iomem *base; @@ -140,7 +141,7 @@ static struct watchdog_device bcm2835_wdt_wdd = { .info = &bcm2835_wdt_info, .ops = &bcm2835_wdt_ops, .min_timeout = 1, - .max_timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET), + .max_hw_heartbeat_ms = WDOG_TICKS_TO_MSECS(PM_WDOG_TIME_SET), .timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET), };
Users report about the unexpected behavior for setting timeouts above 15 sec on Raspberry Pi. According to watchdog-api.rst the ioctl WDIOC_SETTIMEOUT shouldn't fail because of hardware limitations. But looking at the code shows that max_timeout based on the register value PM_WDOG_TIME_SET, which is the maximum. Since 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat in watchdog core") the watchdog core is able to handle this problem. This fix has been tested with watchdog-test from selftests. Link: https://bugzilla.kernel.org/show_bug.cgi?id=217374 Fixes: 664a39236e71 ("watchdog: Introduce hardware maximum heartbeat in watchdog core") Signed-off-by: Stefan Wahren <wahrenst@gmx.net> --- drivers/watchdog/bcm2835_wdt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- 2.34.1